gitlab-ci.yml

#image: docker:20.10.6
#services:
#  - docker:20.10.6-dind

stages:
  - build
  - deploy

variables:
  IMAGE_PREFIX: $DOCKER_HUB_USERNAME/$CI_PROJECT_NAME
  IMAGE_TAG: $DOCKER_HUB_USERNAME/$CI_PROJECT_NAME:$CI_COMMIT_SHORT_SHA
  PORT: 8082
  DOCKER_NETWORK: my-network

before_script:
  - docker login -u $DOCKER_HUB_USERNAME -p $DOCKER_HUB_ACCESS_TOKEN

build:
  stage: build
  only:
    - master
  tags:
    - develop
  script:
    - echo $( mvn -version) 
    - mvn clean package
    # && docker push $IMAGE_TAG  // slow to push
    - if [ "$(docker images -a | grep $IMAGE_PREFIX | grep $CI_COMMIT_SHORT_SHA)" ]; then echo No image build or push; else docker build --pull -t $IMAGE_TAG . ; fi
    - echo $(ls) 
    - echo $(pwd) 

deploy:
  stage: deploy
  only:
    - master
  tags:
    - develop
  script:
    - echo $IMAGE_TAG
    # current version container already fail, then remove
    - if [ "$(docker ps -a | grep $IMAGE_PREFIX | grep $CI_COMMIT_SHORT_SHA | grep Exited)" ]; then docker network disconnect $DOCKER_NETWORK $CI_PROJECT_NAME && docker rm $(docker ps -a | grep $IMAGE_PREFIX | grep $CI_COMMIT_SHORT_SHA | grep Exited | awk '{print $1}') -f; fi
    # other version container exist, then stop and remove
    - if [ "$(docker ps -a | grep $IMAGE_PREFIX | grep -v $CI_COMMIT_SHORT_SHA)" ]; then docker network disconnect $DOCKER_NETWORK $CI_PROJECT_NAME && docker stop $(docker ps -a | grep $IMAGE_PREFIX | grep -v $CI_COMMIT_SHORT_SHA | awk '{print $1}') && docker rm $(docker ps -a | grep $IMAGE_PREFIX | grep -v $CI_COMMIT_SHORT_SHA | awk '{print $1}') -f; fi
    # other version images exist, then remove
    - if [ "$(docker images -a | grep $IMAGE_PREFIX | grep -v $CI_COMMIT_SHORT_SHA)" ]; then docker rmi $(docker images -a | grep $IMAGE_PREFIX | grep -v $CI_COMMIT_SHORT_SHA | awk '{print $3}') -f; fi
    # no current version container exist, then run a new container
    - if [ "$(docker ps -a | grep $IMAGE_PREFIX | grep $CI_COMMIT_SHORT_SHA)" ]; then echo No need to run new container; else docker run -d --name $CI_PROJECT_NAME -p $PORT:$PORT $IMAGE_TAG && docker network connect $DOCKER_NETWORK $CI_PROJECT_NAME; fi